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Enhancement of Ethanol Production by The Removal of Fermentation Inhibitors, and Effect of Lignin-derived Inhibitors on Fermentation

에탄올 생산 향상을 위한 발효저해물질 제거와 리그닌 유래 발효저해물질이 에탄올 발효에 미치는 영향

  • Received : 2016.02.29
  • Accepted : 2016.04.23
  • Published : 2016.05.25

Abstract

In this study, ethanol was produced from a biomass hydrolysate that had been treated by electrodialysis (ED) and Amberlite XAD resin to remove fermentation inhibitors. Most of the acetic acid (95.6%) was removed during the ED process. Non-ionizable compounds such as total phenolic compounds, 5-hydroxymethyl furfural, and furfural were effectively removed by the XAD resin treatment. Ethanol production was improved when the ED-treated hydrolysate was treated with XAD-4 resin for a short reaction time. The highest ethanol production from ED-treated hydrolysate was $6.16g/{\ell}$ (after 72 h of fermentation) when the treatment with XAD-4 resin was for 5 min. Among the lignin-derived fermentation inhibitors tested, syringaldehyde in low concentrations (1 and 2 mM) in the hydrolysate increased ethanol production, whereas a high concentration (5 mM) inhibited the ethanol production process. A synthetic medium containing syringaldehyde and ferulic acid was prepared to investigate the synergistic effect of inhibitors on ethanol fermentation. Ethanol production decreased in the mixture of 1 mM syringaldehyde and 1 mM ferulic acid, implying that the effect of ferulic acid on ethanol fermentation is comparable to that of syringaldehyde.

Keywords

ethanol;electrodialysis;XAD resin;fermentation inhibitors

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Acknowledgement

Supported by : 산림청